The Mande languages (Mandén, Manding; ) are a group of languages spoken in several countries in West Africa by the Mandé peoples. These include; Maninka, Mandinka, Soninke, Bambara, Kpelle, Jula, Bozo, Mende, Susu, and Vai. There are around 60 to 75 languages spoken by 30 to 40 million people, chiefly in; Burkina Faso, Mali, Senegal, the Gambia, Guinea, Guinea-Bissau, Sierra Leone, Liberia, Ivory Coast, Mauritania, Ghana and also in northwestern Nigeria and northern Benin. The Mande languages show lexical similarities with the Atlantic–Congo language family, and the two have been classified together as a Niger–Congo language family since the 1950s. However, the Mande languages lack the noun-class morphology that is the primary identifying feature of the Atlantic–Congo languages. Without the help of that feature, a demonstration of the validity of Niger–Congo will require reconstructing both Proto-Mande and Proto-Atlantic–Congo. Until that work is done, linguists have increasingly decided to treat Mande and Atlantic–Congo as independent language families. Valentin Vydrin concluded that "the Mande homeland at the second half of the 4th millennium BC was located in Southern Sahara, somewhere to the North of 16° or even 18° of Northern latitude and between 3° and 12° of Western longitude.". That is now Mauritania and southern Western Sahara. The group was first recognized in 1854 by Sigismund Wilhelm Koelle, in his Polyglotta Africana. He mentioned 13 languages under the heading North-Western High-Sudan Family, or Mandéga Family of Languages. In 1901, Maurice Delafosse made a distinction of two groups. He speaks of a northern group mandé-tan and a southern group mandé-fu. The distinction was basically done only because the languages in the north use the expression tan for ten, and the southern languages use fu. In 1924, Louis Tauxier noted that the distinction is not well founded and there is at least a third subgroup he called mandé-bu. It was not until 1950 that André Prost supported that view and gave further details.